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. 2017 Sep 26;8:1873. doi: 10.3389/fmicb.2017.01873

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Copyright © 2017 Oliveira, Santos, Marcelino, Milani, Zuluaga, Zucareli and Gonçalves.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Response surface plots (RSPs) of the combined effects of independent variables (X₁ vs. X₂, X₁ vs. X₄, and X₂ vs. X₄) on the biomass productivity (A,C,D) and EPS production (B,D,E) of A. brasilense Ab-V5. (A) RSP of the combined effects of glycerol and sucrose on biomass productivity (CFU counts); (B) RSP of the combined effects of glycerol and sucrose on EPS production; (C) RSP of the combined effects of glycerol and K₂HPO₄ on biomass productivity; (D) RSP of the combined effects of glycerol and K2HPO4 on EPS production; (E) RSP of the combined effects of sucrose and K₂HPO₄ on biomass productivity; (F) RSP of the combined effects of sucrose and K₂HPO₄ on EPS production. Expanded equations related to the CFU and EPS plots are presented in Table 3.